Comment 2 for bug 1631156

I believe this will be fixed with a switch to flufl.testing and the latest flake8 package. The latter has several fixes to the plugin infrastructure and the former does flake8 plugins correctly.

The downside is that flufl.testing isn't yet in Debian. See Debian bug #844650 for the ITP, which I'll work on soon. Of course that will mean we'll only be able to run the test suite in Zesty, so I'll have to also figure out workarounds for Yakkety and Xenial (possibly including not backporting these changes, although that will be fairly inconvenient).